78115

Appears in sequences

• Number of 3 X 3 integer matrices with elements in the range [ -n,n ] which generate a group of order two under binary matrix multiplication.at n=15A054466
• a(n)=number of Catalan knight paths in Quadrant I from (0,0) to points on the vertical line x=n. A Catalan knight moves (2 right and 1 up) or (1 right and 1 down).at n=13A096588
• Derived from the centered polygonal numbers: start with the first triangular number, then the sum of the first square number and the second triangular number, then the sum of first pentagonal number, the second square number and the third triangular number, and so on and so on...at n=34A141534
• Indices k such that 26 plus the k-th triangular number is a perfect square.at n=11A154152
• Monotonic ordering of nonnegative differences 5^i-10^j, for 40>= i>=0, j>=0.at n=22A192201
• Number of binary matrices with distinct nonzero rows, a total of n ones and distinct columns each with the same number of ones and columns in decreasing lexicographic order.at n=11A331651